<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
<script>
    var list=[1,2,3,4,5,6,7,8,9];

    function find(list){

    }

    console.log(find(list,5));

</script>
</body>
</html>